What role should I main? Also, what champions would help me with that role?

I have been thinking about what role I want since I am only a few levels away from level 30, in which I will play ranked. I know some might say "don't play ranked once you hit level 30", however this is not my first account (nor have I ever been level 30). I just want a role that can carry games, get kills, and be that one fed guy who could eventually get 1v5 pentas. I really don't care if this is greedy, because I will start a bronze anyway. I would also like to have at least one of the three traits: kiting potential, aoe (preferably) nuke or single target (only If necessary), and/or a decent gap closer.

I would also like it if you don't shoot down my ideas, however you could say whatever you want as long as it is an answer to my problem.